| Brent NW10 Limited | Real estate | 2014 |
| Brentex GAS Limited | Wholesale & retail | 1977 |
| Brentford Limited | Real estate | 2022 |
| Brentwood Housing Ltd | Real estate | 2006 |
| Brentwood Investments Ltd | Real estate | 2001 |
| Brenvoss Fashion Co., Ltd | Wholesale & retail | 2026 |
| Brenzico Limited | Wholesale & retail | 2025 |
| Brest City for Trading Ltd | Wholesale & retail | 2026 |
| Bretherton Barns Management Limited | Real estate | 2004 |
| Bretstar Limited | Professional & scientific | 2023 |
| Bretton Properties 1 Ltd | Professional & scientific | 2017 |
| Bretton Properties 2 Ltd | Professional & scientific | 2017 |
| Brettwood Commercial Ltd | Administrative & support | 2020 |
| Brew & Bite (NW) Ltd | Hospitality | 2025 |
| Brew Haven Cafe Limited | Hospitality | 2024 |
| Brew Monkey Coffee Roasters Limited | Wholesale & retail | 2022 |
| Brew Monkey Limited | Hospitality | 2018 |
| Brew Thirty Two Limited | Hospitality | 2025 |
| Brew UP Productions Ltd | Administrative & support | 2021 |
| Brew. Contact Ltd | Hospitality | 2025 |
| Brewch Cafe Ltd | Hospitality | 2026 |
| Brewch Coffee Ltd | Hospitality | 2025 |
| Brewhaus Limited | Hospitality | 2015 |
| Brewhub H Q Ltd | Hospitality | 2013 |
| Brewhub UK Limited | Professional & scientific | 2013 |
| Brewski Manchester Ltd | Hospitality | 2018 |
| Brewski Chester Ltd | Hospitality | 2021 |
| Brewski Liverpool Ltd | Hospitality | 2025 |
| Brewski South Yorkshire Ltd | Hospitality | 2022 |
| Brexan for Trading Limited | Extraterritorial | 2026 |
| Brexna Limited | Other services | 2022 |
| Brezz Limited | Wholesale & retail | 2025 |
| BRG Recruitment Limited | Administrative & support | 2022 |
| Brght Pro Realty Group Ltd | Extraterritorial | 2026 |
| Brght Rapid Maintenance Team Ltd | Extraterritorial | 2026 |
| Brghtonix Software Ltd | Information & communication | 2025 |
| Brghtwater Software Ltd | Information & communication | 2025 |
| Brgr Wrld Ltd | Hospitality | 2025 |
| Brgrs Limited | Hospitality | 2022 |
| BRH Surgical Ltd | Health & social care | 2020 |
| Brhampersco Limited | Wholesale & retail | 2021 |
| Brian Barr Limited | Professional & scientific | 2010 |
| Brian Clegg (Educational Products) Limited | Wholesale & retail | 1972 |
| Brian Johnson (Building Contractors) Limited | Wholesale & retail | 1987 |
| Brian Mccluggage (Barrister) Ltd | Professional & scientific | 2025 |
| Brian P Hateley Legal Costs Assessors Limited | Professional & scientific | 1997 |
| Brian Patrick Woodall Limited | Extraterritorial | 2022 |
| Brian Summerhayes Ltd | Professional & scientific | 2019 |
| Brian Tumfour Limited | Transport & logistics | 2025 |
| Brian White Tax Resolution Ltd | Professional & scientific | 2020 |
| Brian Woodall Ltd | Construction | 2023 |
| Brian's Property Solutions Ltd | Construction | 2024 |
| Briani Ltd | Administrative & support | 2025 |
| Brianso Ltd | Health & social care | 2025 |
| Brianxls Ltd | Other services | 2018 |
| Briarcroft Service Centre Ltd | Wholesale & retail | 2026 |
| Briarquest Ltd | Households | 2025 |
| Briarwell Properties Ltd | Real estate | 1999 |
| Briarwood (Carleton) Management Company Limited | Households | 2022 |
| Briarwood FIC Limited | Real estate | 2024 |
| Briarwood Retail Ltd | Wholesale & retail | 2014 |
| Briawood Vent Limited | Wholesale & retail | 2026 |
| Brick & Bloom Brighton Limited | Construction | 2025 |
| Brick & Bloom Homes Ltd | Real estate | 2026 |
| Brick & Bloom Property Limited | Real estate | 2025 |
| Brick and Bloom Estate Management Ltd | Administrative & support | 2025 |
| Brick and Pebble Ltd | Other services | 2025 |
| Brick and Sheikh Properties Ltd | Real estate | 2025 |
| Brick Based Brains Ltd | Health & social care | 2024 |
| Brick by Brick Property Group Ltd | Real estate | 2017 |
| Brick by Brick Realty Ltd | Real estate | 2024 |
| Brick Central NW Limited | Wholesale & retail | 2025 |
| Brick Design Studio Ltd | Professional & scientific | 2021 |
| Brick Home Property Ltd | Real estate | 2020 |
| Brick Homes Limited | Real estate | 2017 |
| Brick House Developments Limited | Construction | 2002 |
| Brick N Wood Homes Ltd | Real estate | 2009 |
| Brick Properties Limited | Professional & scientific | 1988 |
| Brick Secure (Holdings) Ltd | Wholesale & retail | 2025 |
| Brick Sweat Records Limited | Information & communication | 2023 |
| Brick Umbrella Ltd | Real estate | 2021 |
| Brick&Basin Ltd | Wholesale & retail | 2026 |
| Brickbase Limited | Construction | 2024 |
| Brickberg Ltd | Wholesale & retail | 2026 |
| Brickbuilt Limited | Construction | 2007 |
| Brickfield Developments Ltd | Real estate | 2019 |
| Brickfield House RM4 Limited | Real estate | 2021 |
| Brickfield House RM4 NO.2 Limited | Real estate | 2021 |
| Brickfield House RM4 NO.3 Limited | Real estate | 2021 |
| Brickfield House RM4 NO.4 Limited | Real estate | 2021 |
| Brickhouse Social Ltd | Hospitality | 2011 |
| Brickhouses Developments Ltd | Households | 2021 |
| Brickincorporated Ltd | Information & communication | 2025 |
| Brickmack Solutions Limited | Real estate | 2023 |
| Brickpaper Limited | Construction | 2004 |
| Bricks & Mentors Ltd | Real estate | 2023 |
| Bricks Alliance Ltd | Real estate | 2025 |
| Bricks and Blocks Properties Ltd | Real estate | 2024 |
| Bricks and Hands Limited | Construction | 2023 |
| Bricks Properties Limited | Real estate | 2017 |